Yeah, I built my whole 90W system for less than $200.
The Goal0 stuff is great for what it is, easily expandable, pre-assembled, designed to be interchangeable. But it's probably not the most cost effective way if you're doing retail prices.
Mark got an excellent deal at OVX on a kit that solved his immediate need, and he has the ability to easily grow his system. His panels are smaller, more portable and more easily handled than mine.
I must admit that the size of these panels that I have makes me want to leave them behind at times. I WISH I could afford the foldable stuff, it would always stay in the truck. The panels I have sit here in the den unless I know I'll need them on a trip.